gunicorn

#!/sbin/runscript
# Copyright 1999-2014 Gentoo Foundation
# Distributed under the terms of the GNU General Public License v2
# $Header: $

[[ -z "${PIDFILE}" ]] && PIDFILE="/var/run/gunicorn/${SVCNAME}.pid"
[[ -z "${BINARY}" ]] && BINARY="/usr/bin/gunicorn"

depend() {
    need net
    use dns logger netmount
}

check_params() {
    if [[ "${SVCNAME}" == "gunicorn" && -z "${I_KNOW}" ]]; then
        ewarn "It is highly recommended to use a symbolic link for this"
        ewarn "script and start via that instead. This allows you to run"
        ewarn "multiple spawn services simultaneously. To do this, simply:"
        ewarn
        ewarn "  ln -s /etc/init.d/gunicorn /etc/init.d/gunicorn.mysvc"
        ewarn "  cp /etc/conf.d/gunicorn /etc/conf.d/gunicorn.mysvc"
        ewarn
        ewarn "If you don't want to be bothered by this message, set I_KNOW=yes"
        ewarn "in your configuration file."
        ewarn
    fi

    if [[ -z "${WSGI_APP}" ]] && [[ -z "${WSGI_TYPE}" ]]; then
        eerror "${WSGI_APP} not set. Exiting"
        return 1
    fi

    if [[ -z "${PIDFILE}" ]]; then
        eerror "PIDFILE must be set in /etc/conf.d/${SVCNAME}"
        return 1
    fi
}

test_pidfile() {
    if [[ ! -f "${PIDFILE}" ]]; then
        eerror "${PIDFILE} does not exist"
        return 1
    fi

    read -r PID <"${PIDFILE}"

    if [[ -z "${PID}" ]]; then
        eerror "${PIDFILE} contains no PID"
        return 1
    fi

    if [[ ! -d "/proc/${PID}" ]]; then
        eerror "${PID} does not appear to be an existing process"
        return 1
    fi

    if awk -F: 'BEGIN { found = 0; } END { exit(found); }; $1 == "State" && $2 !~ /^[[:space:]]*Z / { found = 1; };' "/proc/${PID}/status"; then
        eerror "${PID} does not appear to be an active process"
        return 1
    fi

    return 0
}

kill_pidfile() {
    check_params && test_pidfile || return 1

    ebegin "${1}"
    read -r PID <"${PIDFILE}"
    kill -${2} ${PID}
    local RC=$?
    eend $RC

    return $RC
}

# actions

start() {
    check_params || return 1

    local -a OPTS
    OPTS=( "-c" "${CONFIG}"
           "--daemon"
	   "--log-syslog"
           "--pid=${PIDFILE}"
           "${WSGI_APP}" )

    ebegin "Starting ${SVCNAME} using ${CONFIG}"
    env PYTHONPATH="${PYTHONPATH}" "${BINARY}" "${OPTS[@]}"
    local RC=$?
    eend "${RC}"

    if [[ "${RC}" == 0 ]]; then
        ebegin "No early errors, checking liveliness"
        sleep 1
        if ! test_pidfile; then
            eend 1
            return 1
        fi
        eend 0
    fi

    return "${RC}"
}

status() {
    check_params && test_pidfile
}

stop() {
    kill_pidfile "Stopping (gracefully) ${SVCNAME}" \
                 QUIT
}

force_stop() {
    kill_pidfile "Stopping (disregarding jobs) ${SVCNAME}" \
                 INT
}

reload() {
    kill_pidfile "Telling ${SVCNAME} to reload itself" \
                 HUP
}

extra_commands="${opts} status reload force_stop"